Incandescent vapor-lamp



No. 626,752. Patented lune l3, I899. R. L. DURAN. INCANDESGENT VAPOR LAMP.

(Application filed. July 14, 1898.)

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NEH. I U HHHIUUH UNITED STATES PATENT OFFICE.

ROBERT L. DORAN, OF NASHVILLE, TENNESSEE.

SINCANDESCENT VAPOR-LAM P.

SPECIFICATION forming part of Letters Patent No. 626,752, dated June 13, 1899. Application filed July 14,1898. Serial No. 685,904. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT L. DORAN, a citizen of the United States, residing at Nashville, in the county of Davidson and State of Tennessee, have invented certain new and useful Improvements in Incandescent Vapor- Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to incandescent vaporlamps, and more particularly to the means employed in such lamps for heating the liquid fuel and generating gas therefrom, afterward mixing the gas with air, and burning the mixture under an incandescent mantle.

The objects of my invention are, first, to provide a gas-generator that may be operated continuously either while the light is in operation or extinguished; second, to produce a continuous generator that can be made at small expense and will consume but a small quantity of fuel, and, third, to provide a generator that will in no way obstruct the light-giving zone of the incandescent mantle and at the same time aid in keeping the mixture of gas and air at a high temperature during its passage to the burners. I accomplish these objects by the means illustrated in the accompanying drawings, throughout the several views of which similar figures of reference refor to similar parts.

Figure l is a front elevation of a lamp-body containing my improvement, portions of the body in front of the generator being removed. Fig. 2 is an enlarged detail of the generatorpipe and adjacent portions of the supply-pipe and mixing-chamber. Fig. 3 is a horizontal section of the mixing-tube, generator, and supply-pipe, taken on the line A B of Fig. 2.

Ashut-off valve 1 in the supply-pipe admits the liquid fuel under pressn re to the inverted- U-shaped vaporizing-pipe 2 and the atomizin g-valve 3,through which the vaporized fuel is injected into the air-mixing tube 4. The mixed vapor and air passes up through a screen in the top of the burner 5 and is ignited under an incandescent mantle surmonnting the burner. The mantle is not shown in the drawings.

Included within the bend of the U-shaped vaporizing-pipe 2 and preferably attached by brazing or otherwise to the side of the mixingchamber 4 is a somewhat-flattened tube 6, closed at the bottom and open at the top, with its edges provided with slits or perforations 6, directed toward the branches of the pipe 2, for purposes hereinafter described. The under side of the bend in pipe 2 is provided with a small opening 2", arranged to discharge into theend of the flattened pipe 6. I

Referring to the various parts comprising my invention, the method of lighting and operatin g the lamp is as follows: The atomizingvalve 3 being closed, fuel under pressure is admitted through the shut-off valve 1 into the pipe 2. A small portion of the fuel is ejected from the opening 2 into the pipe 6 and is'then ignited at the openings 6. The flame from the openings 6 surrounds the branches of the vaporizing-pipe 2, raisingthe fuel contained therein to a high temperature in a very short time and changing the discharge from the opening 2 from a liquid to a jet of highly-inflammable gas. The clearance-space between the burners 6 and the pipe 2 is such as to allow the heating-zone of the flame to strike the pipe 2. The jet of gas entering the pipe 6 entrains with itself a portion of atmospheric air, forming a mixture capable of producing intense heat. It is evident that immediately after turning on the valve 1 and igniting the fuel at the openings 6 the oil-supply to the lamp is intensely heated and the lamp is in condition for lighting.

Opening the atomizing-valve 3, which may be of the construction described and claimed in my application, Serial No. 682,831, allows the heated vapor from pipe 2 to be injected into the opening of the air-mixing chamber 4:, where it entrains sufficient air to insure I perfect combustion. The mixture of vapor and air is further heated in its passage to the burner by reason of the proximity of the mixing-tube to the vapor-generator. It is thus seen that a highly-heated mixture of vapor and air passes up the pipe 4 and may be ignited above the burnerand used to heat an incandescent mantle, as is now usual in lamps of this type.

Some of the advantages of the construction herein described are its simplicity and compactness. There are but few parts and all 3 may be closed, the lamp being then kept by the continuous generator in condition for immediate lighting.

lVhen'gasolene is employed for fuel, the openings 6 emit a non-luminous blue flame entirely odorless and giving no carbon deposit.

By attaching the generator 6 to the air-mixing chamber 4 I attain not only compactness and cheapness of construction, but also great efficiency and economy of fuel by utilizing the surplus of heat required to vaporize the oil in pipe 2 for superheating the mixture of oilvapor and air in the miXing-chamberboth by conduction through the metal of the tubes and by convection and radiation from the flame.

It is evident that after once lighting this continuous generator the lamp remains for an indefinite period in a condition for immediate lighting Without Waiting for the generation of gas from the cold fuel. The construction and arrangement to effect this purpose form an essential part of my invention, and are What I desire to secure by Letters Patent.

What I claim as my invention is 1. In an incandescent lamp, the combination with the burner, and the mixing-chamber, of a heating-pipe open at one end and closed at the other end and provided with series of perforations, a vaporizing-tube ex tended in proximity to the perforations of said heating-pipe and having an opening for 40 discharge of fuel into the open end of said heating-pipe and an atomizing-valve connected with the vaporizing-tube and arranged to discharge into the mixing-chamber, substantially as described.

2. In an incandescent lamp, the combination with the mantle, burner, valves and mixing-chamber; of a flattened tube open at one end and closed at the other end, said tube having lateral perforations throughout its length; and a fuel-supply pipe extending along the perforated sides of said flattened tube, the supply-pipe having an opening for'the discharge of fuel into the open end of the flattened tube, substantially as and for the pur pose described. a

. 3. In an incandescent lamp, the combination with a mixing-chamber, and a burner above said chamber, of a laterally-perforated heating-pipe in contact with the mixing-cham- 60 her and having one end open and its other end closed, a vaporizing-tube located below the burner in proximity to the lateral perforations of the heating-pipe and having an opening for discharge of fuel into the open end of said heating-pipe, and an atomizingvalve connected with the vaporizing-tube and arranged to discharge into the mixing-chamber, substantially as described.

In testimony WhereofI affix my signature 70 in presence of two Witnesses.

ROBERT L. DORAN.

\Vitnesses:

Gno. B. WILLOOX, R. S. THOMPSON. 

